Heating tube, aerosol generating product, and method for manufacturing a heating tube

Abstract

This application relates to a heating tube, an aerosol generating product, and a method for manufacturing a heating tube. The heating tube comprises a tubular body with a penetration-resistant layer, a strip-shaped induction heating element, and a heat insulating layer. The penetration-resistant layer has at least an inner penetration-resistant portion that surrounds the tubular body to form a containment space. The induction heating element is located outside the inner penetration-resistant portion and is arranged spirally in the circumferential direction of the tubular body. The induction heating element heats the aerosol generating material.

Description

Technical Field

[0001] (Cross - reference to related applications) This application claims the priority of a Chinese patent application with an application date of November 30, 2023, an application number of 202311630289.0, and a title of "Heating Tube, Aerosol - Generating Product, and Manufacturing Method of Heating Tube", and all of its content is incorporated herein by reference.

[0002] The present invention relates to the technical field of non - combustion heating, and specifically to induction heating tubes, aerosol - generating products, and manufacturing methods of induction heating tubes.

Background Art

[0003] Non - combustion heating devices based on the principle of magnetic induction heating have attracted wide attention due to characteristics such as high heating efficiency and fast temperature - rising speed. Currently, many non - combustion heating devices based on the principle of magnetic induction heating have an induction coil provided around the accommodation chamber of the aerosol - generating substrate in a smoking device, and a heating body made of a magnetic - permeable material is provided at the central position of the accommodation chamber of the aerosol - generating substrate. The heating body is embedded at the central position of the aerosol - generating substrate, thereby realizing the heating of the aerosol - generating substrate.

[0004] Since the heating body is provided at the central position of the aerosol - generating substrate, heat is transmitted from the center to the outside in the radial direction of the aerosol - generating substrate. As a result, the central position of the aerosol - generating substrate is over - heated, while the heating of the outer periphery in its radial direction is insufficient, that is, there is a risk that the heating of the aerosol - generating material becomes non - uniform.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The main technical problem to be solved by this application is to provide a heating tube, an aerosol - generating product, and a manufacturing method of the heating tube, and to solve the technical problem of non - uniform heating of the aerosol - generating material.

Means for Solving the Problems

[0006] According to the first embodiment, one example is a heating tube comprising a tubular body and a containment space located within the tubular body, wherein the containment space is used to contain an aerosol generating material, and the tubular body is A penetration-preventing layer having at least an inner penetration-preventing portion arranged around the axis of the tubular body and surrounding to form the containment space, An induction heating layer comprising a strip-shaped induction heating element, wherein the induction heating element extends in the axial direction of the tube and is arranged spirally in the circumferential direction of the tube, and the induction heating layer is located outside the inner penetration prevention portion in the radial direction of the tube, A heating tube is provided, which includes an insulating layer that is arranged in the circumferential direction of the tube to surround the housing space and covers at least the outside of the induction heating element in the radial direction of the tube.

[0007] In one selective embodiment, the induction heating element has a plurality of heating sections arranged in the axial direction of the tube, and each heating section is spirally wound around the outer circumference of the inner penetration prevention section.

[0008] In one selective embodiment, the multiple heating units are spaced apart in the axial direction of the tube, and two adjacent heating units are offset in the axial direction of the tube.

[0009] In one selective embodiment, the multiple heating units are arranged in parallel with spacing in the axial direction of the tube, and two adjacent heating units overlap at least partially in the axial direction of the tube.

[0010] In one selective embodiment, the spirally arranged induction heating element has an odd number of turns on the radially outer side of the inner penetration prevention portion.

[0011] In a selective embodiment, the penetration-preventing layer further includes an outer penetration-preventing portion located outside the inner penetration-preventing portion in the radial direction of the pipe, the outer penetration-preventing portion being connected to the inner penetration-preventing portion and wound around the axis of the inner penetration-preventing portion, and at least a portion of the induction heating element being wound between the outer penetration-preventing portion and the inner penetration-preventing layer in the radial direction of the pipe.

[0012] In one selective embodiment, the outer penetration prevention portion forms a multilayer structure that is wound around the axis of the pipe and arranged radially around the pipe, and at least a portion of the induction heating element is wound between two adjacent outer penetration prevention portions.

[0013] In a selective embodiment, the thermal insulation layer includes a strip-shaped thermal insulation body arranged spirally in the axial direction of the pipe.

[0014] In a selective embodiment, the insulator has a plurality of insulators arranged in the axial direction of the tube, each of which has a helical structure, and each insulator corresponds to the heating section, covering the outside of the corresponding heating section in the radial direction of the tube.

[0015] In one selective embodiment, the penetration-preventing layer is fixedly connected to the induction heating layer, and the induction heating layer is fixedly connected to the heat insulating layer.

[0016] According to a second embodiment, one example provides an aerosol generating product comprising an aerosol generating material located within the containment space and a heating tube as described in any one of the above items.

[0017] According to a third embodiment, one example is a method for manufacturing a heating tube, wherein the heating tube includes a penetration-preventing layer, a strip-shaped induction heating element, and a heat insulating layer. The steps include sequentially stacking the aforementioned penetration-preventing layer, the induction heating element, and the heat insulating layer to form a multilayer structure, A step of forming a tube by winding the multilayer structure around a winding rod, comprising: attaching at least a portion of the penetration-preventing layer to the outer surface of the winding rod and winding it; winding the induction heating element spirally around the outside of the penetration-preventing layer at an inclined angle; and covering at least the outside of the induction heating element with the heat insulating layer. The present invention provides a method for manufacturing a heating tube, which includes the step of removing the tubular body from the winding rod along the axial direction of the winding rod.

[0018] In a selective embodiment, covering at least the outside of the induction heating element with the insulating layer is: The method includes wrapping the induction heating element spirally around the outside of the penetration-preventing layer at an inclined angle, and then wrapping the heat insulating layer around the outside of the penetration-preventing layer around which the induction heating element is wrapped to cover it.

[0019] In one selective embodiment, the insulating layer includes a strip-shaped insulating body, and the step of winding the multilayer structure around a winding rod to form a tube is, The process further includes covering the outside of the corresponding induction heating element with the aforementioned insulating material, and wrapping the induction heating element and the insulating material together.

[0020] In one selective embodiment, the penetration-preventing layer extends in a first direction, and the step of sequentially laminating the penetration-preventing layer, the induction heating element, and the heat insulating layer to form a multilayer structure is, This includes shifting the starting end of winding the penetration-preventing layer and the starting end of winding the induction heating element in the first direction.

[0021] In one selective embodiment, the penetration-preventing layer extends in a first direction, The step of sequentially stacking the aforementioned penetration-preventing layer, the induction heating element, and the heat insulating layer to form a multilayer structure is, This includes setting the extension direction of the induction heating element to form an angle of 35° to 65° with the first direction.

[0022] In a selective embodiment, attaching at least a part of the penetration prevention layer to the outer peripheral surface of the winding rod and winding it includes bringing the start end of winding of the penetration prevention layer into close contact with the outer peripheral surface of the winding rod and making the axial direction of the winding rod orthogonal to the first direction. [Effect of the Invention]

[0023] According to the heating tube, the aerosol generating product, and the manufacturing method of the heating tube of the above embodiment, the tube body of the heating tube includes a penetration prevention layer, an induction heating body, and a heat insulation layer. The penetration prevention layer has at least an inner penetration prevention part surrounded so as to form an accommodation space. The inner penetration prevention part can prevent the penetration of the aerosol generating base material in the accommodation space. The induction heating body is located outside the inner penetration prevention part in the radial direction of the tube body, extends in the axial direction of the tube body, and is arranged in a spiral shape in the circumferential direction of the tube body. By the induction heating body generating heat in an alternating magnetic field, heating of the aerosol generating material in the accommodation space can be realized. Further, since the entire heating tube is located outside the aerosol generating base material in the radial direction, the heat receiving surface of the aerosol generating base material becomes the outer peripheral surface for contacting the inner penetration prevention part, whereby the area of the heat receiving surface of the aerosol generating base material can be increased. Furthermore, by heat being transmitted from the outside in the radial direction to the inside, the heating efficiency of the aerosol generating base material can be increased, the temperature difference between the outer periphery and the central position of the aerosol generating base material can be reduced, and it helps to improve the heating uniformity of the entire aerosol generating base material. The heat insulation layer covers the outside of the induction heating body in the radial direction of the tube body. Due to the heat insulation effect of the heat insulation layer, external outflow of heat can be avoided, the temperature difference between the inside and the outside of the aerosol generating base material can be further reduced, the heating uniformity of the entire aerosol generating base material can be further improved, and the influence on the normal operation of the smoking device due to the generation of high temperature can be avoided. [Brief Description of the Drawings]

[0024] [Figure 1] It is a schematic structural diagram of the side surface of the heating tube in one embodiment. [Figure 2] It is a schematic structural diagram of the side surface of the heating tube in another embodiment. [Figure 3]This is a schematic diagram of the side structure of the heating tube in another embodiment. [Figure 4] This is a schematic diagram of the unfolded structure of the tube wall of a heating tube in one embodiment. [Figure 5] This is a schematic diagram illustrating the positional relationship of the penetration prevention layer, induction heating element, and heat insulating layer in the radial direction of the heating tube in one embodiment. [Figure 6] This is a schematic diagram illustrating the positional relationship of the penetration prevention layer, induction heating element, and heat insulating layer in the radial direction of the heating tube in another embodiment. [Figure 7] This is a schematic diagram illustrating the positional relationship of the penetration prevention layer, induction heating element, and heat insulating layer in the vertical stacking direction during the manufacturing process of a heating tube in one embodiment. [Figure 8] This is a schematic diagram illustrating the positional relationship of the penetration prevention layer, induction heating element, and heat insulating layer in the vertical stacking direction during the manufacturing process of a heating tube in another embodiment. [Figure 9] This is a flowchart of the manufacturing method for a heating tube in one embodiment. [Figure 10] This is a schematic diagram of the structure of an aerosol generating product in one embodiment. [Modes for carrying out the invention]

[0025] The present application will be described in more detail below with reference to specific embodiments and drawings. Here, in different embodiments, similar parts are given the corresponding similar reference numerals. In the following embodiments, many detailed descriptions are provided to make the present application easier to understand. However, those skilled in the art will readily understand that some features may be omitted or replaced with other elements, materials, or methods as appropriate. In some cases, some operations related to the present application may not be described or explained in the specification to prevent the core of the application from being obscured by excessive explanation, but those skilled in the art will not need to explain these related operations in detail, and will be able to fully understand them based on the descriptions in the specification and general technical knowledge of the art.

[0026] Furthermore, the characteristics, operations, or features described in the specification can be combined in any appropriate manner to form various embodiments. At the same time, each step or operation in the description of the method can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the order in the specification and drawings is merely for the purpose of clearly describing a particular embodiment and is not intended to be a required order unless otherwise explicitly stated.

[0027] The numbers such as "First," "Second," etc., assigned to the components in this specification are merely for distinguishing the objects being described and do not have any order or technical meaning. Unless otherwise specified, the terms "connection" and "linking" as used in this application include both direct and indirect connections (linking).

[0028] Referring to Figures 1 to 8, this application provides a heating tube 4 including a tubular body and a containment space 44 inside the tubular body, the containment space 44 being used to contain an aerosol-generating material, the tubular body including a penetration-resistant layer 41, an induction heating layer and an insulating layer 43, the penetration-resistant layer 41 being arranged around the axis of the tubular body and having at least an inner penetration-resistant portion 411 that surrounds to form the containment space 44, the inner penetration-resistant portion 411 being able to effectively prevent the penetration of the aerosol-generating substrate into the containment space 44.

[0029] The induction heating layer includes a strip-shaped induction heating element 42, which extends in the axial direction of the tube, is arranged spirally in the circumferential direction of the tube, and is located outside the inner penetration prevention section 411 in the radial direction of the tube. The induction heating element 42 can generate heat in an alternating magnetic field, and the heat can pass through the inner penetration prevention section 411 to heat the aerosol generating substrate. Thus, the outer surface of the aerosol generating substrate becomes the heat receiving surface. Compared to the conventional structure in which the heating element is inserted at the central position of the aerosol generating substrate, this effectively increases the heat receiving area of ​​the entire aerosol generating substrate, improves the heat transfer efficiency to the central interior of the aerosol generating substrate, reduces the temperature difference between the central position and the outer surface of the aerosol generating substrate, and contributes to improving the heating uniformity of the entire aerosol generating substrate.

[0030] The insulating layer 43 is positioned around the circumferential direction of the tube, surrounding the containment space 44 and covering at least the outside of the induction heating element 42 in the radial direction of the tube. This prevents heat from the induction heating element 42 from diffusing to the outside and traps the heat radially inside the insulating layer 43, which helps reduce heat loss. As a result, the uniformity of heating of the entire aerosol-generating substrate can be further improved, and the high temperature generated from the heating tube 4 can be prevented from affecting the normal operation of the smoking device.

[0031] In Figures 1 to 8, the solid line represents the outer contour of the penetration-preventing layer 41, the dashed line represents the outer contour of the induction heating element 42, and the chained line represents the outer contour of the heat insulating layer 43. The structure shown by the inclined cross-sectional line is the heat insulating layer 43. In Figures 1 to 4 and 10, the outer contour of the induction heating element 42 and the outer contour of the heat insulating layer 43 overlap, and the heat insulating layer 43 covers the induction heating element 42. The two chained lines in Figure 7 represent the base 45.

[0032] As shown in Figures 1 to 8, the penetration-preventing layer 41, the induction heating element 42, and the heat insulating layer 43 can all be in sheet form, and after laminating the three, they can be formed into a tube by winding. In some embodiments, the penetration-preventing layer 41 is made of a rectangular sheet form, and the penetration-preventing layer 41 can be made of cellulose paper, carbon nanotube paper, or aramid paper, etc. The material of the penetration-preventing layer 41 is such that it prevents the aerosol-generating substrate from penetrating through the penetration-preventing layer 41 to the outside, and because the thickness of the penetration-preventing layer 41 is thin, the thickness and tensile strength of the penetration-preventing layer 41 must be such that it is not punctured by the induction heating element 42 during the winding process. For example, in one embodiment, the thickness of the penetration-preventing layer 41 is 50 to 100 μm, which is advantageous for heat conduction, and the tensile strength is 1.1 to 2.0 KN / m.

[0033] The induction heating element 42 includes a permeable material that can generate heat in an alternating magnetic field. The permeable material may be an element or a compound containing iron, copper, chromium, nickel, etc. Specifically, the induction heating element 42 has a strip-shaped, magnetic layered structure. As shown in Figure 8, it may be laminated with the penetration-resistant layer 41 on its own, or as shown in Figure 7, it may be integrated with a substrate 45 and combined with the substrate 45 to form an induction heating layer. For example, it may be integrated with thin cellulose paper and then laminated with the penetration-resistant layer 41.

[0034] The insulating layer 43 can be formed from at least one of aerogel, polysaccharide gel, diatomaceous earth, or molecular sieve, and has a porous sheet-like structure. The thickness and tensile strength of the insulating layer 43 must also satisfy the requirement that it will not be punctured by the induction heating element 42 during the winding process. For example, in one embodiment, the thickness of the insulating layer 43 is greater than 100 μm, the porosity is >65%, and the tensile strength can be the same as that of the penetration-resistant layer 41 to facilitate winding.

[0035] In some embodiments, the penetration-preventing layer 41 is a rectangular sheet-like structure before winding, and its length is perpendicular to the axial direction of the winding rod (not shown) before winding. The penetration-preventing layer 41 has an inner penetration-preventing portion 411 located radially inward in the radial direction of the tube. The inner penetration-preventing portion 411 is wound 360° around the axis of the tube, and after winding, it becomes a cylindrical structure with both ends open. The internal space of the cylindrical structure becomes a containment space 44. This completely seals the aerosol-generating substrate inside the tube, achieving sealing and penetration prevention effects.

[0036] In some embodiments, the penetration-resistant layer 41 further has an outer penetration-resistant portion 412, and the penetration-resistant layer 41 can be wrapped around the winding rod two or more times during the winding process, so that the innermost penetration-resistant layer 41 in the radial direction of the pipe becomes the inner penetration-resistant portion 411, and the portion located radially outside the inner penetration-resistant portion 411 becomes the outer penetration-resistant portion 412, the outer penetration-resistant portion 412 is connected to the inner penetration-resistant portion 411 in the circumferential direction of the pipe and is provided by being wound around the axis of the inner penetration-resistant portion 411, and the entire penetration-resistant layer 41 is laminated with the induction heating element 42 and then wound together, so that at least a part of the induction heating element 42 is provided between the inner penetration-resistant portion 411 and the outer penetration-resistant portion 412, and as shown in Figures 5 and 6, in a structure in which the outer penetration-resistant portion 412 is wound multiple times around the axis of the pipe, the outer penetration-resistant portion 412 forms a multilayer structure arranged in the radial direction of the pipe, so that at least a part of the induction heating element 42 is also provided between two adjacent outer penetration-resistant portions 412.

[0037] Naturally, in some other embodiments, when the circumferential dimensions of the penetration-resistant layer 41 to the tube are relatively small, the penetration-resistant layer 41 may have only an inner penetration-resistant portion 411, or when the circumferential dimensions of the penetration-resistant layer 41 to the tube are limited, the penetration-resistant layer 41 may further have an inner penetration-resistant portion 411 and an outer penetration-resistant portion 412 that goes around the entire circumference, with at least a portion of the induction heating element 42 provided between the inner penetration-resistant portion 411 and the outer penetration-resistant portion 412, and the remaining portion of the induction heating element 42 may be spirally wrapped around the outer circumferential surface of the outer penetration-resistant portion 412.

[0038] Furthermore, the statement in this application that "the outer penetration prevention portion 412 is wrapped multiple times around the axis of the pipe" can be understood as meaning that the number of turns the outer penetration prevention portion 412 is wrapped around the inner penetration prevention portion 411 is greater than one turn, and this can be an integer or a non-integer number of turns.

[0039] In some embodiments, the induction heating element 42 has a plurality of heating sections 421 that are sequentially and continuously provided in the direction of extension of its helical structure, and each heating section 421 is spirally wrapped around the outer circumference of the inner penetration prevention section 411, that is, the induction heating element 42 has a plurality of belt-shaped heating sections 421.

[0040] For example, in one embodiment, referring to Figure 2, the induction heating element 42 and the heat insulating layer 43 in Figure 2 have overlapping outer contours, and two heating sections 421 are provided. The two heating sections 421 are spaced apart in the axial direction of the tube, and the two adjacent heating sections 421 are generally offset in the axial direction of the tube. These two heating sections 421 can individually heat aerosol generating substrates located at different positions in the axial direction of the tube. For example, the heating tube 4 can be divided into a first section and a second section along its axial direction, with one of the two heating sections 421 located in the first section and the other in the second section. This achieves offsetting the two heating sections 421 in the axial direction of the tube. The heating section 421 located in the first section is used to heat the aerosol generating substrate corresponding to the first section, and the heating section 421 located in the second section is used to heat the aerosol generating substrate corresponding to the second section.

[0041] This allows for the provision of separate coils corresponding to the first and second parts in the smoking device, and enables the heating of the two coils independently in the pre-inhalation and post-inhalation stages, respectively. In other words, throughout the entire inhalation process, the two heating units 421 independently heat the aerosol generating substrate in the pre-inhalation and post-inhalation stages, thereby reducing waste due to overheating of the aerosol generating substrate in the pre-inhalation stage, increasing the amount of smoke in the post-inhalation stage, and improving the heating efficiency of the aerosol generating substrate.

[0042] In another embodiment, referring to Figure 3, the induction heating element 42 and the insulating layer 43 in Figure 3 have overlapping outer contours, and two heating sections 421 are provided, the two heating sections 421 are spaced apart and arranged in parallel in the axial direction of the tube, and spaced apart and arranged in parallel in a direction perpendicular to the spiral line, the two heating sections 421 may be spaced apart and arranged in parallel before winding, their parallel direction is perpendicular to the extending direction of each heating section 421, and in this way, two spiral heating sections 421 arranged in parallel are formed after winding.

[0043] Naturally, in some other embodiments, the number of heating sections 421 can be set to three or four, etc. Alternatively, in some other embodiments, the induction heating element 42 may have only one heating section 421, that is, a single strip-shaped induction heating element 42 is spirally wound around the circumferential direction of the tube. When the induction heating element 42 has multiple heating sections 421 provided separately, each heating section 421 of the induction heating element 42 can be integrated into the same base body 45 and combined with the base body 45 to form an induction heating layer, thereby facilitating winding and positioning.

[0044] In some embodiments, referring to Figures 5 and 6, the induction heating element 42 and the penetration-preventing layer 41 are wound together in a laminated state, so that at least a portion of the induction heating element 42 is provided between the inner penetration-preventing portion 411 and the outer penetration-preventing portion 412, or in some other embodiments, at least a portion of the induction heating element 42 is also provided between two adjacent outer penetration-preventing portions 412.

[0045] Referring to Figure 1, in an embodiment in which the outer penetration-preventing portion 412 of the penetration-preventing layer 41 is not provided, the penetration-preventing layer 41 is wrapped around only once and has only an inner penetration-preventing portion 411, and the induction heating element 42 is wrapped around the outer surface of the inner penetration-preventing portion 411 in a columnar and spiral manner.

[0046] In an embodiment in which the outer penetration-preventing portion 412 of the penetration-preventing layer 41 is wrapped around only one circumference, the induction heating element 42 is wrapped around one or more circumferences, and is spirally wrapped between the inner penetration-preventing portion 411 and the outer penetration-preventing portion 412, and outside the outer penetration-preventing portion 412. The first circumference of the wrapped induction heating element 42 is located between the inner penetration-preventing portion 411 and the outer penetration-preventing portion 412, and the second circumference or multiple circumferences radially outward are all located radially outward from the outer penetration-preventing portion 412.

[0047] In embodiments in which multiple outer penetration-preventing portions 412 of the penetration-preventing layer 41 are wrapped around it, the overlapping area when the penetration-preventing layer 41 and the induction heating element 42 are stacked is large. Referring to Figures 5 and 6, after the penetration-preventing layer 41, induction heating element 42 and heat insulating layer 43 are wrapped in this manner, the space between two adjacent induction heating elements 42 is separated by one outer penetration-preventing portion 412 or one layer. Furthermore, during the wrapping process, the two adjacent outer penetration-preventing portions 412 can reliably grip the ends of the induction heating elements 42, thus preventing the induction heating elements 42 from moving in the circumferential direction relative to the penetration-preventing layer 41 during wrapping.

[0048] Referring to Figure 1, in an embodiment in which the induction heating element 42 is wrapped around multiple times, two adjacent induction heating elements 42 are positioned at the same location in the circumferential direction of the tube, spaced apart in the axial direction of the tube. For example, each circumference of the induction heating element 42 can be divided into a front winding section, an intermediate winding section, and a rear winding section that are sequentially and continuously arranged in the circumferential direction of the tube, with the corresponding angles of each section in the circumferential direction of the tube all being 120°. The two adjacent front winding sections are spaced apart in the axial direction of the tube, the two adjacent intermediate winding sections are spaced apart in the axial direction of the tube, and the two adjacent rear winding sections are also spaced apart in the axial direction of the tube. This prevents the induction heating element 42 from forming a shielding structure on the radially outer side of the inner penetration prevention section 411, and at the same time prevents a portion of the aerosol generating substrate from being excessively heated, which contributes to the uniform heating of the aerosol generating substrate.

[0049] Referring to Figure 1, the number of turns of the induction heating element 42 is set to an odd number, which may be 3 as shown in Figure 1, or in other embodiments, it may be 5, 7, 9 or more odd numbers. This allows the induction heating element 42 with an odd number of turns to form an effect that divides the electromagnetic field into triangles, making the heat field distribution of the induction heating element 42 more uniform and contributing to the uniform heating of the aerosol-generating substrate.

[0050] Regarding the heat insulating layer 43, in some embodiments, the heat insulating layer 43 can be in a tubular structure. Before winding, the heat insulating layer 43 is in a rectangular or square sheet structure. Referring to Figure 7, when the penetration-preventing layer 41, induction heating element 42, and heat insulating layer 43 are laminated, the heat insulating layer 43 is located at the end of the winding process. Referring to Figure 6, during the winding process, the heat insulating layer 43 is wound only once, forming a tubular structure that covers the radially outer sides of the induction heating element 42 and the penetration-preventing layer 41.

[0051] Naturally, in the embodiment shown in Figure 5, the heat insulating layer 43 may further include a strip-shaped layered heat insulating body 430, the heat insulating body 430 extending in the axial direction of the pipe and arranged spirally in the circumferential direction of the pipe. In one embodiment, the heat insulating body 430 has a plurality of heat insulating sections 431 arranged in the axial direction of the pipe, each heat insulating section 431 having a strip-shaped layered structure and arranged spirally in the circumferential direction of the pipe, the heat insulating section 431 corresponding to the heating section 421 and covering the outside of the corresponding heating section 421 in the radial direction of the pipe. When the insulating layer 43 is laminated with the impenetrable layer 41 and the induction heating element 42 before wrapping, it can be understood that the insulating body 430 completely covers the side of the induction heating element 42 opposite to the impenetrable layer 41. Referring to Figure 4, the width dimension of the strip structure of the insulating body 430 can be equal to the width dimension of the strip structure of the induction heating element 42, or, referring to Figure 8, in some other embodiments, the width dimension of the strip structure of the insulating body 430 may be greater than the width dimension of the strip structure of the induction heating element 42. Both of these structures can satisfy the requirement that in the lamination direction, the orthographic projection of the induction heating element 42 onto the insulating body 430 is entirely located on the insulating body 430, and that after wrapping, the insulating body 430 completely covers the outside of the induction heating element 42 in the radial direction of the pipe.

[0052] In some embodiments, the width dimension of the strip-shaped structure of the insulating material 430 is greater than the width dimension of the strip-shaped structure of the induction heating element 42. Furthermore, after wrapping the induction heating element 42 and the insulating material 430, two adjacent turns of the induction heating element 42 are positioned at the same location in the circumferential direction of the pipe with a gap in the axial direction of the pipe, and two adjacent turns of the insulating material 430 are either continuously provided at the same location in the circumferential direction of the pipe with a offset in the axial direction of the pipe, or partially overlapping (in embodiments where two adjacent turns of the insulating material 430 partially overlap in the axial direction of the pipe at the same location in the circumferential direction of the pipe, it is necessary to ensure that the insulating material 430 located on the radially inner side and the induction heating element 42 located on the radially outer side do not overlap in the axial direction of the pipe). By setting the multiple turns of insulating material 430 arranged continuously in the axial direction, the heat generated from the induction heating element 42 is completely contained within the radially inner side of the insulating layer 43, preventing heat from escaping through the gaps between two adjacent turns of insulating material 430.

[0053] In some embodiments, in order to avoid relative movement of the penetration-resistant layer 41, induction heating element 42, and heat insulating layer 43 in the winding direction during the winding process, the penetration-resistant layer 41, induction heating element 42, and heat insulating layer 43 are sequentially laminated, and then the penetration-resistant layer 41 and induction heating element 42 are fixedly connected with an adhesive, and the induction heating element 42 and heat insulating layer 43 are fixedly connected with an adhesive. In the process of achieving the fixed connection between the penetration-resistant layer 41 and the induction heating element 42, the adhesive may be applied only to the side surface of the induction heating element 42 facing the penetration-resistant layer 41 at the winding start end, and in the process of achieving the fixed connection between the induction heating element 42 and the heat insulating layer 43, the adhesive may be applied only to the side surface of the induction heating element 42 facing the heat insulating layer 43 at the winding end end. Naturally, in order to improve the stability of the structure in which the induction heating element 42 is fixedly connected to the penetration-resistant layer 41 and the heat insulating layer 43, adhesive may be applied to both sides of the induction heating element 42.

[0054] Alternatively, in some other embodiments, the induction heating element 42 and the penetration-preventing layer 41 and the heat insulating layer 43 are not fixedly connected, and during the winding process, the position of the induction heating element 42 in the winding direction can be ensured not to change by the clamping action between the inner penetration-preventing portion 411 and the outer penetration-preventing portion 412, or by the clamping action between the penetration-preventing layer 41 and the heat insulating layer 43.

[0055] In the radial direction of the pipe, the impermeable layer 41 has a winding start end located on the inside and a winding end located on the outside, and similarly, the induction heating element 42 also has a winding start end and a winding end. In embodiments in which the induction heating element 42, the impermeable layer 41, and the heat insulating layer 43 are not fixedly connected, refer to Figures 6 to 8. In order to facilitate the winding of the induction heating element 42, during the lamination process of the impermeable layer 41 and the induction heating element 42, the impermeable layer 41 extends in a first direction which is its longitudinal direction, and the winding start end of the impermeable layer 41 and the winding start end of the induction heating element 42 are offset in the first direction. Thus, when winding using a winding rod, the impermeable layer 41 is first wound onto the winding rod, and at the start of winding the induction heating element 42, the pressing action between the impermeable layer 41 and the winding rod prevents the induction heating element 42 from moving relative to the impermeable layer 41.

[0056] This application further provides a method for manufacturing a heating tube 4, the heating tube 4 being the heating tube 4 described in any one of the above embodiments, and referring to Figure 9, the method for manufacturing the heating tube 4 includes steps 100 to 300.

[0057] In step 100, the penetration-resistant layer 41, the induction heating element 42, and the heat insulating layer 43 are sequentially stacked to form a multilayer structure, with the induction heating element 42 placed between the penetration-resistant layer 41 and the heat insulating layer 43 in the stacking direction. It is understandable that the heating tube 4 may have a structure of three or more layers, for example, one of which may be a multilayer composite structure, for example, the induction heating element 42 may be combined with the base 45 to form an induction heating layer, or other layers such as adhesive layers may be provided between two adjacent layers. To facilitate understanding, a three-layer structure will be described as an example in the following embodiment.

[0058] In some embodiments, referring to Figure 4, the penetration-preventing layer 41 is a rectangular sheet-like structure, the induction heating element 42 is a strip-shaped layered structure, and the heat insulating layer 43 includes a heat insulating element 430 with a strip-shaped layered structure as shown in Figure 4, the dimensions and shape of the heat insulating element 430 being the same as those of the induction heating element 42.

[0059] After sequentially laminating the penetration-resistant layer 41, the induction heating element 42, and the heat insulating layer 43, the dimensions of the penetration-resistant layer 41, the induction heating element 42, and the heat insulating layer 43 can be made equal in the longitudinal direction of the penetration-resistant layer 41.

[0060] On the other hand, in order to avoid changing the relative position between the induction heating element 42 and the penetration-resistant layer 41 during the winding process of the induction heating element 42 on the winding rod, in some preferred embodiments, the longitudinal direction of the penetration-resistant layer 41 is set as the first direction, and the penetration-resistant layer 41 extends in the first direction, and step 100 is, The method further includes offsetting the starting end of winding the penetration-preventing layer 41 and the starting end of winding the induction heating element 42 in a first direction.

[0061] In one embodiment, referring to Figures 6 to 8, the starting end of the penetration-preventing layer 41 is exposed to the outside of the induction heating element 42. When the three-layer structure is wound using a winding rod, the starting end of the penetration-preventing layer 41 is wound onto the winding rod first. This prevents the induction heating element 42 from moving relative to the penetration-preventing layer 41 due to the pressing action between the penetration-preventing layer 41 and the winding rod when the starting end of the induction heating element 42 is wound onto the winding rod.

[0062] On the other hand, in order to improve the heating efficiency of the heating tube 4 and reduce the axial spacing between the two adjacent induction heating elements 42 on the tube, in some embodiments, step 100 is performed. The method further includes setting the longitudinal direction of the induction heating element 42 to form an angle of 35° to 65° with respect to the first direction.

[0063] If the angle is too small, the two adjacent induction heating elements 42 on the molded heating tube 4 may overlap axially, which does not cause problems but is detrimental to improving the heating efficiency of the heating tube 4. If the angle is too large, the spacing between the two adjacent induction heating elements 42 on the molded heating tube 4 may become too large, reducing the heating efficiency of the heating tube 4. Therefore, by positioning the induction heating elements 42 at an angle of 35° to 65° with the first direction during stacking, it is possible to satisfy the requirement of having a certain spacing between the two adjacent induction heating elements 42 on the molded heating tube 4 in the axial direction, and furthermore, it is possible to avoid the spacing becoming too large and affecting the heating efficiency of the aerosol-generating substrate.

[0064] Step 200 involves wrapping the multilayer structure around a winding rod to form a tube, which includes attaching at least a portion of the penetration-resistant layer 41 to the outer surface of the winding rod and surrounding it to form a cylindrical structure, and wrapping the induction heating element 42 spirally around the outside of the penetration-resistant layer 41 at an inclined angle, and covering at least the outside of the induction heating element 42 with the heat insulating layer 43.

[0065] In some embodiments, the length of the penetration-resistant layer 41 is made larger than at least the circumferential dimension of the winding rod in order to ensure that at least a portion of the penetration-resistant layer 41 is bonded to the outer surface of the winding rod and surrounds it to form a cylindrical structure. As a result, the cylindrical structure surrounded by at least a portion of the penetration-resistant layer 41 becomes the inner penetration-resistant portion 411 in the embodiment of the heating tube 4 described above.

[0066] The winding rod may be a rod-shaped structure with a circular cross-section, and may have a diameter of 6 mm to 7.2 mm. The multilayer structure is wound around the winding rod clockwise to produce a tube, or in some other embodiments, the winding rod may have an elliptical cross-section.

[0067] In order to ensure that the induction heating element 42 is spirally wound around the cylindrical structure at an inclined angle after being wrapped, in step 100, when the penetration-resistant layer 41, the induction heating element 42, and the heat insulating layer 43 are laminated, the longitudinal direction of the strip-shaped structure of the induction heating element 42 and the longitudinal direction of the penetration-resistant layer 41 are set to form an acute angle.

[0068] In the following two embodiments, the outside of the induction heating element 42 can be covered with the insulating layer 43. In some embodiments, referring to Figures 1, 4, 5, and 8, the insulating layer 43 includes an insulating body 430 in the form of a strip-shaped layered structure, the width dimension of the strip-shaped structure of the insulating body 430 being greater than or equal to the width dimension of the strip-shaped structure of the induction heating element 42, in step 100, the longitudinal direction of the insulating body 430 and the longitudinal direction of the induction heating element 42 coincide, and the insulating body 430 covers the side of the induction heating element 42 opposite to the penetration-proof layer 41, so that the orthographic projection of the induction heating element 42 onto the insulating body 430 in the vertical stacking direction is entirely located on the insulating body 430 and is completely shielded by the insulating body 430, so that in step 200, during the winding process of the multilayer structure, the outside of the corresponding induction heating element 42 is covered with the insulating body 430, and the induction heating element 42 is wound together with the insulating body 430 so that the insulating body 430 completely covers the outside of the induction heating element 42 in the radial direction of the tube. Furthermore, by increasing the width dimension of the strip-shaped structure of the insulating body 430, the insulating body 430 forms a continuous cylindrical structure in the axial direction of the pipe after being wrapped, covering the insulating layer 43 and a portion of the permeability-resistant layer 41, thereby improving the insulating effect of the insulating layer 43.

[0069] In some other embodiments, referring to Figures 6 and 7, the heat insulating layer 43 is a rectangular sheet structure, and in step 100, the heat insulating layer 43 is laminated to the end of the winding of the induction heating element 42 in the first direction which is the length direction of the penetration-proof layer 41, and overlaps with the end of the winding of the induction heating element 42. Thus, in step 200, the heat insulating layer 43 is wound around the winding rod in the post-winding section, and the width dimension of the heat insulating layer 43 is set to be equal to the width dimension of the penetration-proof layer 41 and the dimension in the direction perpendicular to the first direction of the induction heating element 42, so that after winding is complete, the heat insulating layer 43 completely covers the outside of the penetration-proof layer 41 around which the induction heating element 42 is wound, and provides good heat insulating effect.

[0070] In some embodiments, in order to avoid cutting the heating tube 4 after molding, or to reduce the amount of cutting of the heating tube 4 after molding, step 200 of winding the three-layer structure around a winding rod to form the tube is performed. The method further includes bringing the starting end of the penetration-preventing layer 41 into close contact with the outer surface of the winding rod, and orienting the length direction of the winding rod perpendicular to the first direction.

[0071] Thus, the three-layer structure is wound around the winding rod with the first direction perpendicular to the length direction of the winding rod, which helps to make the axial end faces of the wound heating tube 4 flush with each other. Furthermore, under conditions where the width dimension of the penetration-preventing layer 41 meets the requirements, the formed heating tube can be used directly without cutting. In addition, if it is necessary to cut the formed heating tube 4, the amount of cutting required for the heating tube 4 can be reduced, saving material usage and costs.

[0072] In step 300, remove the tube from the winding rod along its axial direction.

[0073] In some embodiments, after the three-layer structure is wrapped around a winding rod to form a tube, the frictional force between two adjacent layers in the wrapped and formed three-layer structure maintains the cylindrical structure of the tube, and when the tube is removed from the winding rod, a heating tube is formed. Naturally, in some other embodiments, if the dimensions of the tube formed by wrapping the three-layer structure do not meet the requirements, it is also possible to cut the tube to the desired dimensions after removing it from the winding rod.

[0074] This application further provides an aerosol generating product comprising an aerosol generating substrate and a heating tube 4 as described in any one of the above embodiments, wherein the aerosol generating substrate is located within a housing space 44 of the heating tube 4, and the aerosol generating substrate comprises at least one of particulate, disordered filamentous, sheet-like, paste-like, or columnar porous structures made of tobacco material.

[0075] For example, in some embodiments, referring to Figure 10, the aerosol generating substrate includes particulate smoke generating material, and the aerosol generating product is further arranged to include a sealing member to prevent the particulate smoke generating material from leaking out of the end of the heating tube 4, the sealing member being fixed to at least one axial end of the heating tube 4, and for example, the heating tube 4 and the sealing member can be fixedly connected by an adhesive at only that end.

[0076] In some embodiments, the aerosol generating product further includes an outer tube 1, a filter member 2, and a stopper 3, wherein the stopper 3 and a heating tube 4 filled with smoke generating material are sequentially inserted into one end of the outer tube 1 in the longitudinal direction, and the filter member 2 is provided at the other end of the outer tube 1 in the longitudinal direction. Exemplarily, the heating tube 4 becomes a rigid tube after manufacturing is complete.

[0077] In one embodiment, the stopper 3 and the filter member 2 are spaced apart, forming a hollow cooling passage between them. Understandably, the stopper 3 and the filter member 2 may be in direct contact without pre-securing a cooling passage between them, in which case the stopper 3 is a fixed cooling member, and the aerosol passage of the stopper 3 also serves as the cooling passage.

[0078] A heating tube 4, which is loaded with a non-solidified smoke-generating material such as particulate, filamentous, or sheet-like material and sealed at one end by a sealing member, is inserted into the outer tube from one end of the outer tube, with the open end of the heating tube 4 facing the stopper 3, and the other end of the heating tube 4 is sealed by the stopper 3, thereby preventing the smoke-generating material from leaking out of the heating tube 4. An aerosol passage is formed in the center or outer wall of the stopper 3, through which aerosols can pass.

[0079] In some other embodiments, the smoke generating material within the aerosol generating substrate can be a sheet-like smoke generating material, a paste-like material, or a columnar porous structure, which eliminates the need to provide a sealing member and a stopper 3 in the aerosol generating product, or to provide an outer tube 1 and a filtering member 2. Instead, a heating tube 4 filled with the smoke generating material is formed as the aerosol generating product as a whole, and a heating chamber containing the aerosol generating substrate and a separate mouthpiece communicating with the heating chamber, which performs a similar function to the filtering member 2, can be provided in the smoking device.

[0080] In some embodiments, the heating tube 4 becomes a rigid tube after manufacturing is complete and can serve as the outer tube of the aerosol generating product. The stopper 3 and smoke generating material are sequentially placed at one end of the heating tube 4 in the longitudinal direction, the filter member 2 is provided at the other end of the heating tube 4 in the longitudinal direction, and the induction heating element 42 can be formed only on the outer surface corresponding to the smoke generating material. [Explanation of symbols]

[0081] 1 Outer tube 2 Filtration members 3 Stopper 4 heating tube 41 Penetration prevention layer 411 Inner seepage prevention part 412 Outside penetration prevention part 42 Induction heating element 421 Heating section 43. Insulation layer 430 Insulator 431 Insulation section 44 Containment space 45 Base

Claims

1. A heating tube comprising a tubular body and a containment space within the tubular body, wherein the containment space is used to contain an aerosol generating material, and the tubular body is A penetration-preventing layer having at least an inner penetration-preventing portion arranged around the axis of the tubular body and surrounding to form the containment space, An induction heating layer comprising a strip-shaped induction heating element, wherein the induction heating element extends in the axial direction of the tube and is arranged spirally in the circumferential direction of the tube, and the induction heating layer is located outside the inner penetration prevention portion in the radial direction of the tube, A heating tube characterized by comprising an insulating layer arranged in the circumferential direction of the tube to surround the housing space and covering at least the outside of the induction heating element in the radial direction of the tube.

2. The heating tube according to claim 1, characterized in that the induction heating element has a plurality of heating sections arranged in the axial direction of the tube, and each of the heating sections is spirally wound around the outer circumference of the inner penetration prevention section.

3. The heating tube according to claim 2, characterized in that the plurality of heating units are arranged at intervals in the axial direction of the tube, and two adjacent heating units are offset in the axial direction of the tube.

4. The heating tube according to claim 2, characterized in that the plurality of heating units are arranged in parallel with intervals in the axial direction of the tube, and two adjacent heating units overlap at least partially in the axial direction of the tube.

5. The heating tube according to claim 1, characterized in that the number of turns on the radially outer side of the inner penetration prevention portion of the spirally arranged induction heating element is odd.

6. The heating tube according to claim 1, wherein the penetration-preventing layer further includes an outer penetration-preventing portion located outside the inner penetration-preventing portion in the radial direction of the tube, the outer penetration-preventing portion is connected to the inner penetration-preventing portion and is wound around the axis of the inner penetration-preventing portion, and at least a portion of the induction heating element is wound between the outer penetration-preventing portion and the inner penetration-preventing layer in the radial direction of the tube.

7. The heating tube according to claim 6, characterized in that the outer penetration prevention portion is wound around the axis of the tube to form a multilayer structure arranged radially of the tube, and at least a portion of the induction heating element is wound between two adjacent outer penetration prevention portions.

8. The heating tube according to any one of claims 1 to 7, characterized in that the insulating layer includes a strip-shaped insulating body arranged spirally in the axial direction of the tube.

9. An aerosol generating product characterized by comprising an aerosol generating material located within the aforementioned containment space and a heating tube according to any one of claims 1 to 8.

10. A method for manufacturing a heating tube, wherein the heating tube includes a penetration-preventing layer, a strip-shaped induction heating element, and a heat insulating layer. The steps include sequentially stacking the aforementioned penetration-preventing layer, the induction heating element, and the heat insulating layer to form a multilayer structure, A step of forming a tube by winding the multilayer structure around a winding rod, comprising: attaching at least a portion of the penetration-preventing layer to the outer surface of the winding rod and winding it; winding the induction heating element spirally around the outside of the penetration-preventing layer at an inclined angle; and covering at least the outside of the induction heating element with the heat insulating layer. A method for manufacturing a heating tube, comprising the step of removing the tubular body from the winding rod along the axial direction of the winding rod.

11. The aforementioned penetration-preventing layer extends in a first direction, and the step of sequentially stacking the penetration-preventing layer, the induction heating element, and the heat insulating layer to form a multilayer structure is, A method for manufacturing a heating tube according to claim 10, characterized in that the starting end of winding the penetration-preventing layer and the starting end of winding the induction heating element are offset in the first direction.

12. The aforementioned penetration-preventing layer extends in the first direction, The step of sequentially stacking the aforementioned penetration-preventing layer, the induction heating element, and the heat insulating layer to form a multilayer structure is, A method for manufacturing a heating tube according to claim 10, characterized in that the extending direction of the induction heating element is set to form an angle of 35° to 65° with the first direction.

Images